Leopold Bloom’s library contains works of various categories: religious ("The Hidden Life of Christ, Philosophy of the Talmud", “an ancient hagadah book”), historical ("The Secret History of the Court of Charles II", Lockhart’s "Life of Napoleon", Hozier’s "History of the Russo-Turkish War"), astronomic ("A Handbook of Astronomy", "The Story of the Heavens" by Sir Robert Ball), geographic (Ellis’s "Three Trips to Madagascar", "Voyages in China" by “Viator”, "In the Track of the Sun"), geometric ("Short but yet Plain Elements of Geometry" written in French by F. Ignat. Pardies), literary (Shakespeare’s "Works", Denis Florence McCarthy’s "Poetical Works", "When We Were Boys" by William O’Brien, "The Stark-Munro Letters" by A. Conan Doyle, Soll und Haben by Gustav Freytag), philosophical (Thoughts from Spinoza), as well as practical guides and calendars. Most of these works and professional publications are occasionally referred to, as leitmotifs, in the epic of Dublin, yet, most frequently Joyce chooses to quote the romance book he made up, namely, "Sweets of Sin!" Richard M. Kain claims that there are a few thousands of leitmotifs persevering in "Ulisses", which is the unquestionable essence of this encyclopaedic novel.